Some rifles like Pioneer Powder some do not. I found when I tested American Pioneer Powder in both the 2f & 3f grades, that it did not like anything heavy. If the projectile got over 300 grains the accuracy seemed to fail. Also if you shoot conicals, I did not have good results with APP.

Were you having problems with Triple Se7en powder? Another good powder often overlooked because of the dirty nature of it is Pyrodex RS. It is normally cheaper then the other powders, and while it might fowl the barrel more then others, it is a very consistant and good performing powder. So if a few extra minutes cleaning at the end of the day is not a problem, do not over look Pyrodex RS as well.

From what I have read on the Optima, they shoot a lot of different things well. Powerbelts, Shockwaves, XTP's, and even some conicals. All you can do it try different projectiles and see which one works best.